Multi-tab large cylindrical battery

Abstract

The utility model relates to the technical field of cylindrical battery cells, in particular to a multi-tab large cylindrical battery, which comprises a negative plate and a positive plate, the positive plate is arranged at one end of the negative plate, a negative coating area is arranged on the surface of the negative plate, a negative coating blank area is arranged on the surface of the negative coating area, and the negative coating blank area is arranged on the surface of the negative coating area. A negative electrode lug is arranged on the surface of the negative electrode coating blank area, and a positive electrode coating area is arranged on the surface of the positive plate. According to the utility model, through the arrangement of the multi-tab cylindrical battery core, the conduction path of the battery is changed from transmission along a single tab to simultaneous transmission along a plurality of tabs, so that on one hand, the current conduction distance is shortened, the internal resistance of the battery is effectively reduced, and the charge-discharge efficiency of the battery is improved; on the other hand, the situation that the electrolyte cannot permeate and the liquid injection efficiency is influenced due to multi-tab leveling is avoided, and by adopting the pole piece, the electrolyte can conveniently flow into the roll core, so that the liquid injection and discharging efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cylindrical battery technology field especially relates to a kind of multi-tab big cylindrical battery. BACKGROUND

[0002] Prior art such as the utility model with publication number CN219321380U, the patent discloses a kind of multi-tab tab, battery and cylindrical battery, the patent adopts coating area and blank area adjacent to coating area, the blank area is away from the side of coating area and is provided with tab area;The tab area is divided into multiple sections, including no-tab section, multi-tab section and single-tab section;The no-tab section, multi-tab section and single-tab section are adjacently arranged, and the multi-tab section is located between no-tab section and single-tab section;The length of tab in multi-tab section is greater than the length of tab in single-tab section;In the utility model, after tab rubbing, there are more overlapping areas, effective welding area increases, overcurrent area increases, welding strength increases, so that the battery has the advantages of low internal resistance, high platform voltage and high discharge rate, solves the problem that the existing winding battery uses full-tab tab, after tab rubbing, the contact between tabs is not tight, which reduces the effectiveness of welding and causes high battery resistance.

[0003] At present, tab mainly includes two structures, one is full-tab or multi-tab, and the other is single-tab. Single-tab has larger internal resistance, lower overcurrent capacity and poor heat transfer effect, which can cause low service life of battery. After winding, full-tab needs to be rubbed, and tab stacking increases the thickness of winding battery end, which can cause serious metal chips during rubbing, can pierce diaphragm to cause micro-short circuit, affects long-term cycle performance of battery, and another multi-tab rubbing process is to press the originally vertical tab down, so that tabs contact each other to play a better current collecting role. However, the end surface after rubbing is too close, so it is not conducive to the infiltration of electrolyte, which affects the liquid injection efficiency. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving the problem of tab stacking in prior art, which increases the thickness of winding battery end, causes serious metal chips during rubbing, can pierce diaphragm to cause micro-short circuit, affects long-term cycle performance of battery, and the end surface after rubbing is too close, so it is not conducive to the infiltration of electrolyte, which affects the liquid injection efficiency, and proposes a kind of multi-tab big cylindrical battery.

[0005] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of multi-pole ear big cylindrical battery, including negative plate and positive plate, the positive plate is arranged at one end of negative plate, the surface of negative plate is provided with negative coating area, the surface of negative coating area is provided with negative coating blank area, the surface of negative coating blank area is provided with negative pole lug, the surface of positive plate is provided with positive coating area, the surface of positive coating area is provided with positive coating blank area, the surface of positive coating blank area is provided with positive pole lug area, positive pole lug area is provided with positive pole lug.

[0006] Preferably, the positive coating blank area includes a positive insulating area A, which is arranged on the surface of the positive coating area, and the surface of the positive insulating area A is provided with a positive insulating area D, the positive insulating area A and the positive insulating area D form an insulating area, the width of the insulating area is less than the width of the pole lug area formed by the positive pole lug, and the positive insulating area A and the positive insulating area D made of AT9 or AT11 or PVDF can increase the insulation effect of the connection part.

[0007] Preferably, the number of negative pole lugs is multiple, and the multiple negative pole lugs are arranged in a horizontal array with respect to the negative plate, the number of positive pole lugs is multiple, and the multiple positive pole lugs are arranged in a horizontal array with respect to the positive plate, and the distance between the adjacent two pole lugs gradually increases in the direction from one end of the pole lug to the other end of the pole lug. The distance of the increasing pole lug distance is Ln-1+C (n≥2), wherein C is a constant value, generally in the range of 1-3 mm.

[0008] Further, in the horizontal direction of the pole piece, the width of the coating area is greater than the width of the pole lug area, and the first pole lug of the pole lug area is away from the left edge of the coating area by a first distance, and the tail pole lug of the pole lug area is away from the right edge of the coating area by a second distance; the first distance and the height of the pole lug area in the vertical direction satisfy a second size relationship, and the second distance and the height of the pole lug area in the vertical direction satisfy a third size relationship.

[0009] Preferably, the multi-pole ear cylindrical battery core includes a diaphragm body, the surface of the diaphragm body is wound with a terminal adhesive tape, the diaphragm body includes a first diaphragm, the first diaphragm is wound on the surface of the negative plate, the surface of the negative plate is also wound with a second diaphragm, the second diaphragm is in contact with the surface of the positive plate, and the positive plate, the first diaphragm, the second diaphragm and the negative plate form a battery core by winding.

[0010] Preferably, the negative tab is located on one side of the multi-tab cylindrical battery cell, the negative tab penetrates the end of the first and second separators, the distance of the tab on the positive sheet beyond the top end of the first and second separators is ≤ the height h1 of the positive tab, and the distance of the tab on the negative sheet beyond the bottom end of the first and second separators is ≤ the height h2 of the negative tab.

[0011] Preferably, the positive tab is located on the side of the multi-tab cylindrical battery cell away from the negative tab, the positive tab penetrates the end of the first and second separators, the height of the positive tab and the negative tab is consistent from the innermost layer to the outermost layer, stacked together, and the width of all layers of positive tabs and negative tabs ranges from 5 to 8 mm.

[0012] Compared with the prior art, the utility model has the advantages and positive effects that:

[0013] In the utility model, by setting the multi-tab cylindrical battery cell, the battery conduction path changes from transmission along a single tab to transmission along multiple tabs at the same time, on the one hand, the current conduction distance is shortened, the battery internal resistance is effectively reduced, and the charge and discharge efficiency of the battery is improved; on the other hand, the electrolyte infiltration caused by the multi-tab flattening is avoided, the liquid injection efficiency is affected, the above-mentioned sheet is adopted, the electrolyte flows into the winding core, and the liquid injection efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 A three-dimensional structure schematic diagram of the multi-tab large cylindrical battery is provided for the utility model;

[0015] Figure 2 A winding state structure schematic diagram of the multi-tab large cylindrical battery is provided for the utility model;

[0016] Figure 3 A front view structure schematic diagram of the positive and negative terminals of the multi-tab large cylindrical battery is provided for the utility model;

[0017] Figure 4 A positive and negative sheet structure schematic diagram before cutting of the multi-tab large cylindrical battery is provided for the utility model;

[0018] Figure 5 A positive sheet structure schematic diagram after cutting of the multi-tab large cylindrical battery is provided for the utility model;

[0019] Figure 6 A negative sheet structure schematic diagram after cutting of the multi-tab large cylindrical battery is provided for the utility model.

[0020] LEGEND:

[0021] 1, multi-pole ear cylindrical battery; 2, diaphragm body; 20, first diaphragm; 21, second diaphragm; 3, termination tape; 4, negative plate; 40, negative coating area; 41, negative coating blank area; 411, negative pole; 5, positive plate; 50, positive coating area; 51, positive coating blank area; 510, positive insulation area A; 5101, positive insulation area D; 511, positive pole area; 5111, positive pole. DETAILED DESCRIPTION

[0022] Please refer to Figures 1-6 The utility model provides a technical scheme: a kind of multi-pole ear big cylindrical battery, including negative plate 4 and positive plate 5, positive plate 5 is arranged at one end of negative plate 4, the surface of negative plate 4 is provided with negative coating area 40, the surface of negative coating area 40 is provided with negative coating blank area 41, the surface of negative coating blank area 41 is provided with negative pole 411, the surface of positive plate 5 is provided with positive coating area 50, the surface of positive coating area 50 is provided with positive coating blank area 51, the surface of the positive coating blank area 51 is provided with positive pole area 511, the positive pole area 511 is provided with positive pole 5111.

[0023] In the embodiment: positive coating blank area 51 includes positive insulation area A 510, positive insulation area A 510 is arranged on the surface of positive coating area 50, the surface of positive insulation area A 510 is provided with positive insulation area D 5101, positive insulation area A 510 and positive insulation area D 5101 form insulation area, the width of insulation area is less than the width of pole area formed by positive pole 5111, and positive insulation area A 510 and positive insulation area D 5101 made of AT9 or AT11 or PVDF can increase the insulation effect of connecting part.

[0024] In the embodiment: the full-pole ear plate is rectangular structure before cutting, and multi-pole ear positive plate and negative plate have length direction L and width direction W, in the width direction W of multi-pole ear positive plate and negative plate, multi-pole ear plate is divided into coating area and coating blank area, wherein the positive coating blank area includes positive insulation area and positive pole area, the surface of positive insulation area A is coated with active material with width B, and the material is generally AT9 or AT11 or PVDF, and B width value range is 5±0.5mm, and negative coating blank area is not coated with active material, that is, negative coating blank area is also negative pole area.

[0025] Specifically, the number of negative electrode tabs 411 is multiple, the multiple negative electrode tabs 411 are arranged in a horizontal array about the negative electrode sheet 4, the number of positive electrode tabs 5111 is multiple, the multiple positive electrode tabs 5111 are arranged in a horizontal array about the positive electrode sheet 5, and the distance between adjacent two tabs gradually increases in the direction from one end of the tab to the other end of the tab. The distance of the tab distance increase is Ln-1+Cn≥2, wherein C is a fixed constant value, generally in the range of 1-3 mm.

[0026] In the present embodiment: after cutting, the positive and negative electrode sheets with multiple tabs, the positive and negative tab areas are formed into multiple quadrilateral structures of positive and negative tabs by laser cutting, and the multiple positive and negative tabs are arranged in sequence along the length direction L of the positive and negative electrode sheets with multiple tabs. The angle between any one of the multiple positive and negative tabs and the horizontal direction is 90°, and the shape of the tab cut by laser can be changed according to the winding core process, such as trapezoidal, rectangular, etc.

[0027] Specifically, in the horizontal direction of the electrode sheet, the width of the coating area is greater than the width of the tab area, and the first tab of the tab area is away from the left edge of the coating area by a first distance, and the tail tab of the tab area is away from the right edge of the coating area by a second distance; the first distance and the height of the tab area in the vertical direction satisfy the second size relationship, and the second distance and the height of the tab area in the vertical direction satisfy the third size relationship.

[0028] In the present embodiment: the multi-tab cylindrical battery cell 1 includes a diaphragm body 2, the surface of the diaphragm body 2 is wound with a terminal adhesive tape 3, the diaphragm body 2 includes a first diaphragm 20, the first diaphragm 20 is wound on the surface of the negative electrode sheet 4, the surface of the negative electrode sheet 4 is also wound with a second diaphragm 21, the second diaphragm 21 is in contact with the surface of the positive electrode sheet 5, and the positive electrode sheet 5, the first diaphragm 20, the second diaphragm 21 and the negative electrode sheet 4 are formed into a battery cell by winding.

[0029] Specifically, the negative electrode tab 411 is located on one side of the multi-tab cylindrical battery cell 1, the negative electrode tab 411 penetrates the end of the first diaphragm 20 and the second diaphragm 21, the distance between the tab on the positive electrode sheet 5 and the top end of the first diaphragm 20 and the second diaphragm 21 is ≤ the height h1 of the positive electrode tab, and the distance between the tab on the negative electrode sheet 4 and the bottom end of the first diaphragm 20 and the second diaphragm 21 is ≤ the height h2 of the negative electrode tab.

[0030] Specifically, the positive electrode tab 5111 is located on the side of the multi-tab cylindrical battery cell 1 away from the negative electrode tab 411, the positive electrode tab 5111 penetrates the end of the first diaphragm 20 and the second diaphragm 21, the height of the positive electrode tab 5111 and the negative electrode tab 411 is consistent from the innermost layer to the outermost layer, stacked together, and the width range of all layers of the positive electrode tab 5111 and the negative electrode tab 411 is 5-8 mm.

[0031] Working principle: by means of laser cutting equipment to positive plate 5 and negative plate 4 are processed, so that the positive plate 5 and negative plate 4 surface forms tab, complete the processing of tab, according to the order of positive plate 5, second diaphragm 21, negative plate 4 and first diaphragm 20 the above material is stacked, complete stacking, the material is uniformly wound on the ink core, complete winding after using termination tape 3 material package, in turn, the manufacture of battery cell is completed, the application of the utility model to the multiple tab plate avoids the production of metal debris when the winding core is kneaded, thereby reducing the risk of tab debris into the diaphragm, improving the winding rate; At the same time, by stacking tabs to increase the thickness and strength of the tabs, it can effectively avoid welding or not welding and solve the problem that the battery conduction path no longer depends on a single tab. The current transmission changes from along a single tab to along multiple tabs at the same time. On the one hand, the current conduction distance is shortened, the battery internal resistance is effectively reduced, and the battery charge and discharge efficiency is improved. After tab welding, the entire winding core end face is not covered, which is beneficial to the rapid penetration of electrolyte into the battery core during liquid injection, greatly shortening the liquid injection time.

Claims

1. A multi-pole ear large cylindrical battery comprising a negative electrode sheet (4) and a positive electrode sheet (5), characterized by: The positive plate (5) is arranged at one end of the negative plate (4), the surface of the negative plate (4) is provided with a negative coating area (40), the surface of the negative coating area (40) is provided with a negative coating blank area (41), the surface of the negative coating blank area (41) is provided with a negative tab (411), the surface of the positive plate (5) is provided with a positive coating area (50), the surface of the positive coating area (50) is provided with a positive coating blank area (51), the surface of the positive coating blank area (51) is provided with a positive tab area (511), and the positive tab area (511) is provided with a positive tab (5111).

2. The multi-pole ear large cylindrical battery according to claim 1, characterized in that: The positive coating blank area (51) comprises a positive insulating area A (510), and the positive insulating area A (510) is arranged on the surface of the positive coating area (50) and provided with a positive insulating area D (5101) on the surface.

3. The multi-pole ear large cylindrical battery according to claim 1, characterized in that: The number of the negative tabs (411) is multiple, and the multiple negative tabs (411) are arranged in a horizontal array about the negative plate (4); and the number of the positive tabs (5111) is multiple, and the multiple positive tabs (5111) are arranged in a horizontal array about the positive plate (5).

4. A multi-tab large cylindrical battery according to claim 1, comprising a multi-tab cylindrical battery cell (1), characterized in that: The multi-tab cylindrical battery cell (1) comprises a diaphragm body (2), and the surface of the diaphragm body (2) is wound with a terminal adhesive tape (3); the diaphragm body (2) comprises a first diaphragm (20), and the surface of the negative plate (4) is wound with the first diaphragm (20); the surface of the negative plate (4) is further wound with a second diaphragm (21), and the second diaphragm (21) is in contact with the surface of the positive plate (5).

5. The multi-pole ear large cylindrical battery according to claim 4, characterized in that: The negative tab (411) is located on one side of the multi-tab cylindrical battery cell (1), and the end of the negative tab (411) penetrates the first diaphragm (20) and the second diaphragm (21).

6. The multi-pole ear large cylindrical battery according to claim 4, characterized in that: The positive tab (5111) is located on the side of the multi-tab cylindrical battery cell (1) away from the negative tab (411), and the end of the positive tab (5111) penetrates the first diaphragm (20) and the second diaphragm (21).

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